Alternating-current controlling apparatus for hydraulic elevators.



` Mn. L. LINDQUIST. ALTBNTING CURRENT OQNTBOLLING APPARATUS FOB HYDRAULIC ELEVATOS. LPPLIUL'TIOI FILED JUNE 1, 1907.

976,130.I I U Ptented Nov. 15,1910.`

Girona Q13 UNITED STATES PATENT OFFICE.

DAVID L. LINDQUIST, OF YONKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COM- PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ALTERNATING-CURRENT CONTROLLING APPARATUS FOR HYDRAULIC ELEVATORS.

To ctl'whom it may concern:

Be it known that I, DAVID L, LINDQUIs'r, a subject ot' the King ot' Sweden, residing at Yonkers, in the county of Westchester and State of New York, have invented a new and useful Improvement in Alternating- Ourrent Controlling Apparatus for Hydrau-l control of valve mechanism'ot hydraulic elevators particularly of the plunger type.

A further object of the invention is the provision of an automatic push-button alternating current controlling system for a hydraulic elevator.

Other objects of the invention will appear hereinafter', the novel combinations of elements being pointed out in the claims.

The accompanying drawing illustrates an application of my invention, and includes the circuits and connections of an automatic push-button system to change single alternating current to inultiphase current to more efficiently operate electro-magnets ot valve mechanism to in 'turn control a plunger elcvator of the direct-acting type.

Obviously, vthose skilled in the art may make various changes in the details and arrangement of parts Without departing from the spirit and scope of my invention and I desire therefore not to be limited to the precise construct-ion herein disclosed.

In the accompanying drawing the car C is supported on the upper end of the plunger 1 which moves up and down in the iydraulic cylinder 2. A. counterweight W is connected to the top of the car O by the cable or rope B which passes over the sheaves D mounted on an overhead fixed beam. The weight W may be proportioned with respect to the car plunger and live load as desired, but permitting the car to always descend by reason Specification of Letters Patent.

Application ed June 1, 1907.

Patented Nov. '15, 1910.

Serial No. 376,863.

of unbalanced load, the buoyancy of the plunger being preferably compensated for by the counterweight cable V designates a differential main or motor valve and V a pilot valve, for controlling the admission to and exhaust from the cylinder 2 of the motor fluid.

The parts thus tar described are of well known construction, it being understood that main valve apparatus of any construction may be used if desired, but I prefer to use the particular arrangement ot' valve apparatus7 as shown, controlled by an alternating current magnet M, this, however, being the invention of' Frederick IV. Newell, and embodied in his application for patent Ser. No. 365,968, tiled April 2, 1907, alternating current elcctro-n'iagnetic valve apparatus.

The valve apparatus considered as a whole consists essentially of the main valve device V, the pilot valve device V, the alternating current magnet M and intermediate connections. The magnet is in reality double in that it comprises two windings 7l, 72, with an intermediate armature 16 suitably centered normally as `tor instance by a spring in the tube 82. This armature 1G is connected by the rod 15 to the lever Q2 which is pivoted at 21. to the link 20, this link being in turn pi voted to the supporting frame ot' the entire valve apparatus. The lever 22 is connected by the link Q5 to the lcven2\\'l1ich is tulcrumcd at to the main valve stem 1 and is connected at one end to the link 11 and carries a balancing weight 35 at its other end. The link 1l connects the lever 32 to the pilot valve stem 12. Now when the winding 71 receives current to eitect the upward movement of the lever 32 on its fulcrum the pilot valve is moved upwardly in its cylinder 10 and the fluid in the motor of the main valve device is permitted to low through the pipe 8 to the exhaust port 9 of the pilot valve device V. he main valve will then be moved upwardly and the motor tluid permitted to pass from the elevator cylinder through the pipe t to the exhaust port 5. The car will then, descend. When the main valve is thus moved ulnvardly the lever 32 is moved on the fulcrum S3 to recenter the pilot valve.

Upon the denergization of the magnet the armature 16 centers itself and this causes pass from the supply pipe 7,

Athe supply pipe Sto the the main valve to close and mal position, as shown, and that the car is l let the lower solenoid 72 receive stationary, current. .Then the pilot valve will be moved downwardly to permit the supply iuid to through the connecting; pipe 8, to the motor ci the main valve device and the main Valve will thereupon permit the supplytluid to pass from cylinder 2 to litt the car. When the main valve is fully open the pilot valve has again recentered itself and When the magnet is denerffized the pilot opens to the exhaust stop the cer. rllhe system or" circuits and. connect ons for controlling the electro-magnet will now be described. A i; ein line switch S serves to connect the conductors o and ZJ londinefrom a source of single 'linscalternati current supply, to the con ors 59 and 5;, respectively. i

R and Rf designate single-phase electromagnetic reversing switches. lnasmuch these are similar only one will be descrifoA l. Arranged in the solenoid 69 the loose core or plunger (il Whicl. carries on upper end a bridge member 58 For elecM l trically'connecting the contacts and 54: 'when litted'into engagement therewith. Normally the core or plunger 6l rests on n conducting. leatl spring` secured to the fixed block 64- und carryingv the contact 65. `When the solenoid 60 receives sutlicient current to. litt its core the spring 59 will be .released and will automatically move the contact 65 into engagement with the contact 66. lt will therefore he Seen that after 'the solenoid liftsl its core the contacts and (S6 will be held in ennageinent with euch other indepernlently ot' th. solenoid; this t'ea'ture is embodied in my repondinlgY :application No. 353,205, tiled Januai Y 2l, 13.907, controlling4 devices for alternating)` current motors.

in order to change the single phase current from the mains into multiphase current Suitable for operating the electro-i'nagnet l employ a phase-splitting device preferably like that embodied in my copendlng application Ser. No. 357,044, tiled February l2, 190?, alternating current controlling means. Generally, it comprises two resistance elements l, lt?, and two inductance elements J', .l2 connected in bridge form and so arranged with respect to the other circuits as to perform its function. s

ln the car C are up and. down push-.buttons 89 and 8l, and a Simple electric switch port 9 to cause as whenA 'the Winding 72 receives l? which be used in place ot' said push buttons.

it) are the floor push-buttons, (5 the door contacts and 73, 74 the limit switches.

lt' the push-button switch 8l or one of the lower push-button switches 76, is operated, or it the car switch levcr 47 is moved into engagement with the contact t8 a circuit will be closed from. the main c through the solenoid Gl end thence by conductor 84 to and through limit switch 73, conductor 78, the switch operated, conductor 77, door contacts 75, conductor 5l and finally to the other main o through the switch S. The switch R will therefore be operated to effect the electrical connection of the contacts 55, 52 and 5l and the engagement of the contacts 65 and (S6 with each other. Contact GG is in permanent connection with phase-splitting device l? at the point 8G between the inductance tl 'and resistance R2 by means of the conductor 85 vand when the switch R is operated the point 85 is connected by conductors 87, 88 and 89, to the individual coils inductance J2. t1 me the Substantially at the same bridging member 58 in engagement the contact 52 connects the point '9G through the conductors 95 and 5l to the main 7) rlhe opposite point 9stis connected by the conductor through the switch S to thc main o1. is to the points 94C and 96, therefore, the phasc-splittingdevice is connectefl directly across the mains a and l). will also be, observed that the main o is connected by the conductor 97 to the individual coil 98 and that the main is connected through conductor 5l, contact 52, bridge member 58, con-tact and conductor 98y to the individuel coil 99. The coils 98 nd 99 being` in series with each other will theretore be connected across the mains L and o While the. other coilsl() and 91 Will be connected to the *phase-splitting device.

The switch ll when closed aliects only the winding` 7l of the electro-magnet, ono set of coils ot the other T2 being open-circuited contact 5l connected to the'conductor 100 and the other being` open-circuited at contact G9 connected lo the conductor 101. lli/'hen the switch l is closed by the manipulation of the up push-button S0 in the car or in up push-button at one of the landings, thon the circuits of the windings 72 will be closed and as before explained when the Winding 7l receives current to lift the armature lG the main valve Will be o cned to exhaust to permit the car to deseen Where current the main valve will be opened to supply to cause the car to ascend.

ln the system shown the manual switch operated must be lrept'in closed position While the car is moving and when the switch is opened the car will stop. For the sake of simplicity and by i'vayof'illustration merely I have shown one of the least complicated arrangements of push-button circuits but any other automatic puslrbutton system ,of control may be used if desired.

It should be noted that by the einplo'vmentof a niultiphase magnet, the valves may be operated'very quickly to secure a quick starting of the elevator car; and furthermore, where only single-phase current is available the valves may still be e'ectivcly operated in an electric elevator control system kby the interposition of a phase-splittin device to change single-phase currentI to mu ti-plrase current for operating the valve ma yet.' ,Y

'L aving thus described my invention, what I claim as new and desire to have protected by Letters Patent of the United States, iss- 1. The combination .with a hydraulic cle- 4vator and valve aiiparatus to control the flow of motor fluid thereto and therefrom, ot' a double inultiphasealternating current elec troniagnet having two sets of wii'idiiigs for actuating said valve apparatus, a phase- -splitting device to change" single-phase to .multipliase current, aiid a system ot circuits and switches to select one ot said two sets of windings of the inultipliase magnet for receiving multi phase current to etiect the operation of the valve ap iai'atus.

2. The combination ivitlran elevator car, hydraulic moving apparatus, and controlling mechanism, ot"y a imiltipliase electroinagnet having two sets ot' windings, an armature normally intermediate said sets of windings, connections between said armature and said controlling mechanism. a phase-splitting device intermediate zi-source of single-phase alternating currentsupply and said electro'l magnet, and a selective system of circuits and connections to prtaletcrmine the direction ot movement oi said armature.

3. The combination with a plunger elel The combination with an elevator lar,

va plunger connected thereto, a hydraulic cylinder for said plunger, and valve apparatus t'or controlling the llow ot' motor tluid to or from said cylinder, of an electrmi-responsive device having two sets ot polypliasc windings and an armature connected to said valve apparatus, a phase-splitting device between conductors from a source of single phase alternating current supply andA said sets ot' windings, reversing s\\'itches, and up yand down, electric switches at the landings and in the car connected to said reversing switches to ell'ect the -variation ot' the lattci to complete circuits through a corresponding setI ot' said windings, and a magnet for the valve apparatus.

' G. The combination with an elevator car, plunger, cylinder, and controlling valve :ip paratus, ot' an elect'romagnet, an armature connected to .said controlling apparatus and movable in two directions by said electromagnet. io ctl'cct the opening or closing of tlic. valves` a phase splitting device' for changing single phase current from thc source ot' electric current to inultipliase currcnt for said elcctroinagnet. and a push-butautomatic '/,ation of said electon system of circuits and connections for 

